CN110779113B - Air conditioning apparatus - Google Patents

Air conditioning apparatus Download PDF

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Publication number
CN110779113B
CN110779113B CN201910660241.1A CN201910660241A CN110779113B CN 110779113 B CN110779113 B CN 110779113B CN 201910660241 A CN201910660241 A CN 201910660241A CN 110779113 B CN110779113 B CN 110779113B
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China
Prior art keywords
ehp
ghp
control unit
unit
outdoor
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CN201910660241.1A
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Chinese (zh)
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CN110779113A (en
Inventor
大川和伸
吹田义隆
斋藤进午
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Panasonic Intellectual Property Management Co Ltd
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Panasonic Intellectual Property Management Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/54—Control or safety arrangements characterised by user interfaces or communication using one central controller connected to several sub-controllers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
    • F24F3/06—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units
    • F24F3/065—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units with a plurality of evaporators or condensers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/44—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger characterised by the use of internal combustion engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/89—Arrangement or mounting of control or safety devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
    • F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
    • F24F5/001—Compression cycle type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B13/00—Compression machines, plants or systems, with reversible cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B27/00—Machines, plants or systems, using particular sources of energy
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/004—Outdoor unit with water as a heat sink or heat source
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/023—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units
    • F25B2313/0233—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units in parallel arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/025—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple outdoor units
    • F25B2313/0253—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple outdoor units in parallel arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2327/00—Refrigeration system using an engine for driving a compressor
    • F25B2327/001—Refrigeration system using an engine for driving a compressor of the internal combustion type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/07—Details of compressors or related parts
    • F25B2400/075—Details of compressors or related parts with parallel compressors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/13—Economisers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/02—Compressor control
    • F25B2600/025—Compressor control by controlling speed
    • F25B2600/0251—Compressor control by controlling speed with on-off operation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B27/00—Machines, plants or systems, using particular sources of energy
    • F25B27/02—Machines, plants or systems, using particular sources of energy using waste heat, e.g. from internal-combustion engines
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A30/00—Adapting or protecting infrastructure or their operation
    • Y02A30/27—Relating to heating, ventilation or air conditioning [HVAC] technologies
    • Y02A30/274—Relating to heating, ventilation or air conditioning [HVAC] technologies using waste energy, e.g. from internal combustion engine

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Human Computer Interaction (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention provides an air conditioning device which can switch a plurality of outdoor units without interruption in air conditioning and can prevent deterioration of air conditioning performance. The air conditioning device is provided with a GHP control unit (100) and an EHP control unit (101) which control a GHP outdoor unit (2) or an EHP outdoor unit (3), and when the operation of the GHP outdoor unit (2) or the EHP outdoor unit (3) is switched, the GHP control unit (100) and the EHP control unit (101) perform control for starting the stopped outdoor unit and then stopping the operating outdoor unit.

Description

Air conditioning apparatus
Technical Field
The present invention relates to an air conditioner, and more particularly, to an air conditioner using a GHP outdoor unit and an EHP outdoor unit in combination.
Background
Generally, there is known an air conditioning apparatus that performs air conditioning by an indoor unit using an outdoor unit on which a compressor driven by a gas engine or the like is mounted and an outdoor unit on which an electrically driven compressor is mounted.
As such an air conditioning apparatus, for example, an air conditioning apparatus including: a second outdoor unit having a compressor, a four-way valve, and an outdoor heat exchanger with higher capacity; a first outdoor unit having a compressor with a relatively low capacity, a four-way valve, and an outdoor heat exchanger; and an indoor unit connected to the outdoor units by 1 refrigerant system (see, for example, patent document 1).
Documents of the prior art
Patent document
Patent document
Patent document 1: japanese patent laid-open publication No. 2017-150687
Disclosure of Invention
Problems to be solved by the invention
However, in the above-described conventional air conditioning apparatus, when switching the operation of the plurality of outdoor units, an operation switching instruction is issued from the controller, and when the stop outdoor unit and the operating outdoor unit are switched based on the instruction from the controller, each outdoor unit performs an operation in which the operating outdoor unit and the stop outdoor unit stop or operate at respective timings.
In this case, when switching between the stopped outdoor unit and the operating outdoor unit, the outdoor unit stopped from the operating state is quickly stopped, but the outdoor unit started from the stopped state cannot be quickly started because a predetermined start preparation operation is required, and air conditioning is temporarily interrupted, and air conditioning performance is deteriorated.
The present invention has been made in view of the above problems, and an object of the present invention is to provide an air conditioner capable of switching a plurality of outdoor units without interruption in air conditioning and preventing deterioration in air conditioning performance.
Means for solving the problems
In order to achieve the above object, an air conditioner according to the present invention is an air conditioner in which a plurality of outdoor units are connected to indoor units via inter-unit pipes, and each of the outdoor units is operated to perform indoor air conditioning by the indoor unit, the air conditioner including a control unit that controls the outdoor units, wherein the control unit controls the outdoor units to stop operating after the outdoor units that are stopped are started when the operation of the outdoor units is switched.
According to this aspect, when the operation of the outdoor unit is switched, the control unit controls the outdoor unit in operation to be stopped after the stopped outdoor unit is started, so that it is possible to prevent the air-conditioning operation from being temporarily interrupted, and to perform a continuous air-conditioning operation.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the air conditioning apparatus of the present invention, it is possible to prevent the air conditioning operation from being temporarily interrupted and prevent the air conditioning performance from being deteriorated.
Drawings
Fig. 1 is a configuration diagram of an air conditioning apparatus according to an embodiment of the present invention.
Fig. 2 is a block diagram showing a control configuration of the present embodiment.
Fig. 3 is a timing chart showing an operation example of the present embodiment.
Description of the reference numerals
1 air conditioning device
2GHP outdoor unit
3 EHP outdoor unit
4 indoor unit
12 gas engine
13 GHP compressor
15 oil separator
17. 65 outdoor heat exchanger
40 indoor heat exchanger
62 EHP compressor
100 GHP control part
101 EHP control unit
102 indoor control unit
110 controller
111 controller control part
Detailed Description
The air conditioning apparatus according to claim 1 is an air conditioning apparatus in which a plurality of outdoor units are connected to each indoor unit via an inter-unit pipe, the outdoor units are operated, and air conditioning of a room is performed by the indoor units, and the air conditioning apparatus includes a control unit that controls the outdoor units, and when switching operation of the outdoor units, the control unit controls the outdoor units in operation to be stopped after the outdoor units in operation are started.
According to this aspect, when the operation of the outdoor unit is switched, the control unit controls the outdoor unit in operation to be stopped after the stopped outdoor unit is started, so that it is possible to prevent the air-conditioning operation from being temporarily interrupted, and it is possible to realize continuous operation of the air-conditioning system, and as a result, it is possible to prevent deterioration of air-conditioning performance.
The air conditioning apparatus according to claim 2 further includes a controller control unit that transmits a control instruction signal to the control unit, and the control unit that controls the outdoor unit that is in operation to start the outdoor unit that is in operation when receiving a switching instruction signal for the outdoor unit from the controller control unit, and the control unit that controls the outdoor unit that is in operation to stop the outdoor unit.
According to this aspect, the control unit of the outdoor unit that is in operation stops the stopped outdoor unit by starting the stopped outdoor unit with the control unit of the outdoor unit that is in operation based on the switching instruction signal transmitted from the controller control unit, so that the control unit of each outdoor unit can control the start and stop of the outdoor unit so that the operation of the air conditioning system is not interrupted, regardless of the switching instruction signal transmitted from the controller control unit. As a result, the continuous operation of the air conditioning system can be realized, and the deterioration of the air conditioning performance can be prevented.
In the air-conditioning apparatus according to claim 3, the plurality of outdoor units include a GHP outdoor unit including a GHP compressor driven by an engine and an EHP outdoor unit including an EHP compressor driven by a commercial power supply.
According to this aspect, a plurality of outdoor units can be configured from the GHP outdoor unit and the EHP outdoor unit, and when the operations of the GHP outdoor unit and the EHP outdoor unit are switched, the operation of the air conditioning system can be continuously performed without interruption of the operation of the air conditioning system, and as a result, the deterioration of air-conditioning performance can be prevented.
Embodiments of the present invention will be described below with reference to the drawings.
Fig. 1 is a configuration diagram showing an embodiment of an air conditioner according to the present invention.
As shown in fig. 1, the air conditioning apparatus 1 includes: a GHP outdoor unit 2 (2 nd outdoor unit) having a compressor driven by a gas engine as a compressor having a high capacity; an EHP outdoor unit 3 (1 st outdoor unit) having a compressor driven by a commercial power supply as a compressor with a relatively low capacity; and a plurality of indoor units 4. The GHP outdoor unit 2, the EHP outdoor unit 3, and each indoor unit 4 are connected to each other via an inter-unit pipe 5 and an oil balance pipe 6, thereby constituting a refrigeration cycle circuit for performing an air conditioning operation.
The GHP outdoor unit 2 includes: 2 external connection valves 10a and 10b for connecting to the external inter-unit pipe 5; and an oil connection valve 11 for connecting the oil balance pipe 6.
The GHP outdoor unit 2 is provided with a gas engine 12 as an engine and a GHP compressor 13 for compressing a refrigerant by a driving force of the gas engine 12. The GHP compressor 13 is composed of a 1 st GHP compressor 13a and a 2 nd GHP compressor 13b which are arranged in parallel.
The gas engine 12 is configured to generate a driving force by combusting a mixed gas of a fuel such as gas supplied through a fuel control valve (not shown) and air supplied through a throttle valve (not shown).
A drive belt 14 is provided between the output shaft of the gas engine 12 and the driven shaft of the GHP compressor 13, and the GHP compressor 13 is driven by transmitting the driving force of the gas engine 12 through the drive belt 14.
An oil separator 15, a four- way valve 16, and 2 outdoor heat exchangers 17, 17 are connected in this order to the discharge side of the GHP compressor 13, and each outdoor heat exchanger 17 is connected to one external connection valve 10a via a refrigerant pipe 20. An outdoor fan 18 for performing heat exchange between the outdoor heat exchanger 17 and outside air is provided in the vicinity of the outdoor heat exchanger 17.
The other external connection valve 10b is connected to a refrigerant pipe 20, and the refrigerant pipe 20 is connected to the suction side of the GHP compressor 13 via the four-way valve 16 and the liquid accumulator 19 in the middle.
An electric valve 24 and a check valve 25 are connected in parallel to the middle of the refrigerant pipe 20, and a liquid pipe 22 connected to the inflow side of the liquid storage device 19 is connected to the refrigerant pipe 20. A drying core (dry core)39 is provided between the outdoor heat exchanger 17 and the external connection valve 10 a.
Further, a heat exchange refrigerant pipe 23 is connected between the suction side of the GHP compressor 13 and the refrigerant pipe 20, the suction side of the GHP compressor 13 is connected to the refrigerant pipe 20 by the heat exchange refrigerant pipe 23, and an electric valve 26 is provided in the heat exchange refrigerant pipe 23. A plate heat exchanger 27 is provided between the motor-operated valve 26 of the heat exchange refrigerant pipe 23 and the suction side of the GHP compressor 13.
The GHP outdoor unit 2 includes a bypass pipe 28 connecting the discharge side and the suction side of the GHP compressor 13. One end of the bypass pipe 28 is connected between the oil separator 15 and the four-way valve 16, and the other end of the bypass pipe 28 is connected between the accumulator 19 and the four-way valve 16. A part of the refrigerant on the discharge side of the GHP compressor 13 flows to the suction side of the GHP compressor 13 through the bypass pipe 28 due to the pressure difference.
The bypass pipe 28 is provided with a bypass valve 29 that adjusts the flow rate of the bypass pipe 28. The bypass valve 29 is an electrically operated valve that can be opened and closed in stages.
The GHP outdoor unit 2 includes an oil return pipe 30 connecting the oil separator 15 and the suction side of the GHP compressor 13. Due to the pressure difference between the discharge side and the suction side of the GHP compressor 13, the lubricating oil stored in the oil separator 15 flows to the suction side through the oil return pipe 30.
The oil return pipe 30 includes: a 1 st return pipe 31 connecting the oil flow outlet of the oil separator 15 and the suction side of the GHP compressor 13; and a 2 nd return pipe 36 disposed in parallel with respect to the 1 st return pipe 31.
The 1 st return pipe 31 includes a capillary tube 32.
The 2 nd return pipe 36 is connected to the 1 st return pipe 31 so as to bypass the capillary tube 32, one end of the 2 nd return pipe 36 is connected to the upstream side of the capillary tube 32 in the 1 st return pipe 31, and the other end of the 2 nd return pipe 36 is connected to the downstream side of the capillary tube 32 in the 1 st return pipe 31.
The 2 nd return pipe 36 includes a capillary tube 33 and an oil return valve 34 disposed downstream of the capillary tube 33.
The oil connection valve 11 is connected to the oil pipe 35. The oil pipe 35 branches off halfway, and one branch thereof is connected to a position downstream of the oil separator 15 of the refrigerant pipe 20, and the other branch thereof is connected between the capillary tube 33 of the 2 nd return pipe 36 and the oil return valve 34.
The external connection valve 10a connected to the refrigerant pipe 20 is connected to one end of the indoor heat exchanger 40 of each indoor unit 4 via the inter-unit pipe 5. An expansion valve 41 is provided in the middle of the inter-unit pipe 5.
An indoor fan 42 for performing heat exchange between the indoor heat exchanger 40 and the indoor air is provided inside each indoor unit 4.
The other end of each indoor heat exchanger 40 is connected to an external connection valve 10b via an inter-unit pipe 5, and the external connection valve 10b is connected to the refrigerant pipe 20.
Further, the GHP outdoor unit 2 includes a cooling water circuit 50 of the gas engine 12.
The cooling water circuit 50 includes a cooling water three-way valve 52, a plate heat exchanger 27, a radiator 53 disposed adjacent to one outdoor heat exchanger 17, a cooling water pump 54, and an exhaust gas heat exchanger 55 of the gas engine 12, which are connected in this order from the gas engine 12 via a cooling water pipe 51, and is configured to circulate cooling water in the circuit by driving the cooling water pump 54.
The cooling water pipe 51 of the cooling water circuit 50 is indicated by a double-dashed line in fig. 1, and the flow of the cooling water is indicated by a solid arrow.
Heat exchange between the outside air and the cooling water is performed at the radiator 53.
In the plate heat exchanger 27, the refrigerant returned to the GHP compressor 13 is heated by the cooling water flowing through the cooling water pipe 51 by the operation of the motor-operated valve 26. This increases the low-pressure of the refrigerant, thereby improving heating efficiency.
The cooling water circuit 50 can form the 1 st path through which the cooling water flows in order through the gas engine 12, the cooling water three-way valve 52, the radiator 53, the cooling water pump 54, the exhaust gas heat exchanger 55, and the gas engine 12.
Further, the cooling water circuit 50 can form a 2 nd path through which the cooling water flows in order through the gas engine 12, the cooling water three-way valve 52, the plate heat exchanger 27, the cooling water pump 54, the exhaust gas heat exchanger 55, and the gas engine 12.
A hot water three-way valve 56 is provided in the middle of the 1 st path connecting the radiator 53 and the cooling water three-way valve 52. The hot water three-way valve 56 is connected to a hot water heat exchanger 57 that exchanges heat between the cooling water and the hot water, and the cooling water that has passed through the hot water heat exchanger 57 is returned to the upstream side of the cooling water pump 54.
Next, the EHP outdoor unit 3 will be explained.
The EHP outdoor unit 3 includes 2 external connection valves 60 for connection to the external inter-unit piping 5, and an oil connection valve 61 for connection to the oil balance pipe 6.
The EHP outdoor unit 3 includes an EHP compressor 62 driven by a commercial power supply. The EHP compressor 62 is, for example, an inverter compressor whose output can be changed.
An oil separator 63, a four- way valve 64, and 2 outdoor heat exchangers 65, 65 are connected in this order to the discharge side of the EHP compressor 62, and the outdoor heat exchanger 65 is connected to one external connection valve 60a via a refrigerant pipe 66. An outdoor fan 105 (see fig. 2) for performing heat exchange between the outdoor heat exchanger 65 and outside air is provided in the vicinity of the outdoor heat exchanger 65.
A supercooling heat exchanger 90 is provided between the outdoor heat exchanger 65 and the external connection valve 60 a.
A two-line pipe line is formed in the outdoor heat exchanger 65, and the refrigerant pipe 66 on the four-way valve 64 side and the refrigerant pipe 66 on the supercooling heat exchanger 90 side are configured to branch and are connected to the outdoor heat exchanger 65. Further, the outdoor electronic control valves 68 and 68 are provided in the refrigerant pipe 66 on the supercooling heat exchanger 90 side of the outdoor heat exchanger 65, respectively.
The supercooling heat exchanger 90 includes 2 heat exchange units 91 and 91, and the refrigerant pipe 66 on the outdoor heat exchanger 65 side and the refrigerant pipe 67 on the external connection valve 60a side are branched and connected to each heat exchange unit 91 of the supercooling heat exchanger 90.
In the present embodiment, each heat exchange unit 91 is configured as a double-tube heat exchanger, and the pipes outside the heat exchange unit 91 are configured to be connected to the refrigerant pipe 66 on the outdoor heat exchanger 65 side and the refrigerant pipe 67 on the external connection valve 60a side, respectively.
A branch pipe 92 for supercooling is connected to a middle portion of the refrigerant pipe 67 connecting the supercooling heat exchanger 90 and the external connection valve 60a, and the branch pipe 92 for supercooling is connected to an inner pipe 94 of each heat exchange unit 91 through an electronic control valve 93 for supercooling in a middle portion. The refrigerant having passed through the inner pipe 94 of the heat exchange unit 91 is configured to return to the refrigerant pipe 66 between the four-way valve 64 and the accumulator 69 via the supercooling refrigerant pipe 95.
The other external connection valve 60b is connected to the suction side of the EHP compressor 62 via a refrigerant pipe 66, and a four-way valve 64 and a liquid accumulator 69 are provided in the middle of the refrigerant pipe 66.
Further, a refrigerant return pipe 70 branched and connected to the refrigerant pipe 66 between the EHP compressor 62 and the liquid accumulator 69 is provided in a middle portion of the refrigerant pipe 66 between the EHP compressor 62 and the oil separator 63. An electromagnetic valve 71 for returning the refrigerant is provided in an intermediate portion of the refrigerant return pipe 70. When the refrigerant return solenoid valve 71 is opened, a part of the refrigerant is guided to the suction side of the EHP compressor 62 without circulating through the refrigeration cycle.
The lower portion of the oil separator 63 is connected to an oil pipe 72, an intermediate portion of the oil pipe 72 is connected to an oil return pipe 73, and the oil return pipe 73 is connected to the suction side of the EHP compressor 62. The oil return pipe 73 includes 2 branch pipes 74 and 75 branched from the oil pipe 72, one branch pipe 74 is provided with an oil return valve 76, and the other branch pipe 75 is provided with a capillary tube 78. Further, a capillary tube 79 is provided between the connection portions of the branch pipes 74, 75 of the oil pipe 72.
A high-pressure refrigerant pipe 80 is connected to a middle portion of the refrigerant pipe 66 between the oil separator 63 and the four-way valve 64, and the high-pressure refrigerant pipe 80 branches at the middle portion and is connected to a middle portion of the oil pipe 72. An electromagnetic valve 81 for high-pressure refrigerant is provided in a middle portion of the high-pressure refrigerant pipe 80.
Further, the accumulator 69 includes: an inflow pipe 82 into which the refrigerant of the refrigerant pipe 66 flows; and an outflow pipe 83 that conveys the gas refrigerant inside the accumulator 69 to the EHP compressor 62. The outflow pipe 83 is configured to open at an upper portion inside the accumulator 69, and to convey the gas refrigerant accumulated at the upper portion inside the accumulator 69 to the EHP compressor 62.
The EHP compressor 62 is connected to an overflow pipe 84, and the overflow pipe 84 is connected to the suction side of the EHP compressor 62. The overflow pipe 84 is assembled with a filter 85 and a throttle 86 for depressurizing the oil.
The external connection valve 60a of the EHP outdoor unit 3 is connected to one end of the inter-unit pipe 5, and the other end of the inter-unit pipe 5 is connected to the intermediate portion of the inter-unit pipe 5 connecting the external connection valve 10a of the GHP outdoor unit 2 and the indoor unit 4. The external connection valve 60b connected to the refrigerant pipe of the EHP outdoor unit 3 is connected to one end of the inter-unit pipe 5, and the other end of the inter-unit pipe 5 is connected to the intermediate portion of the inter-unit pipe 5 connecting the external connection valve 10b of the GHP outdoor unit 2 and the indoor unit 4.
Further, the oil connection valve 61 of the EHP outdoor unit 3 and the oil connection valve 11 of the GHP outdoor unit 2 are connected via the oil balance pipe 6. Thus, oil can be mutually supplied between the GHP compressor 13 of the GHP outdoor unit 2 and the EHP compressor 62 of the EHP outdoor unit 3 via the oil balance pipe 6, and the balance of the oil amounts of the EHP compressor 62 of the GHP outdoor unit 2 and the EHP compressor 62 of the EHP outdoor unit 3 can be maintained.
In addition, when the cooling operation is performed, the refrigerant flows as indicated by solid arrows in fig. 1, and when the heating operation is performed, the refrigerant flows as indicated by broken lines in fig. 1.
Next, a control structure of the air-conditioning apparatus according to the present embodiment will be described. Fig. 2 is a block diagram showing a control configuration of the present embodiment.
As shown in fig. 2, in the present embodiment, the GHP outdoor unit 2 includes a GHP control unit 100 as a control unit, and the EHP outdoor unit 3 includes an EHP control unit 101 as a control unit. Further, the indoor units 4 each include an indoor control section 102.
In addition, in the present embodiment, the air conditioning apparatus includes a controller 110 that transmits a control instruction signal to the GHP outdoor unit 2, the EHP outdoor unit 3, and the indoor unit 4.
The controller 110 includes a controller control unit 111 for collectively controlling the GHP control unit 100, the EHP control unit 101, and the indoor control unit 102.
These GHP control unit 100, EHP control unit 101, indoor control unit 102, and controller control unit 111 include, for example, an arithmetic processing circuit such as a CPU, and a ROM, RAM, or the like as storage means, and are control units that perform predetermined control by executing a predetermined program.
The GHP control unit 100 is configured to control the driving of the gas engine 12, the outdoor fan 18, and the cooling water pump 54 of the GHP outdoor unit 2, and to control the opening and closing of the external connection valves 10a and 10b, the oil connection valve 11, the electric valve 24, the electric valve 26, the bypass valve 29, the oil return valve 34, and the cooling water three-way valve 52 of the GHP outdoor unit 2 or the opening degree thereof.
The EHP controller 101 is configured to control the drive of the EHP compressor 62 and the outdoor fan 105 of the EHP outdoor unit 3, and to control the opening and closing of the external connection valves 60a and 60b, the oil connection valve 61, the outdoor electronic control valve 68, the refrigerant return electromagnetic valve 71, the oil return valve 76, the high-pressure refrigerant electromagnetic valve 81, and the supercooling electronic control valve 93 of the EHP outdoor unit 3.
The indoor control unit 102 is configured to control the driving of the indoor fan 42 of the indoor unit 4 and to control the opening degree of the expansion valve 41 of the indoor unit 4.
The control by the GHP control unit 100, the EHP control unit 101, and the indoor control unit 102 is performed based on a control instruction signal transmitted from the controller control unit 111.
In this case, in the present embodiment, the GHP control unit 100 is set as a master control unit, the EHP control unit 101 and the indoor control unit 102 are set as slave control units, and a control instruction signal from the controller control unit 111 is first transmitted to the GHP control unit 100, and the control instruction signal is configured to be sequentially transmitted from the GHP control unit 100 to the EHP control unit 101 and the indoor control unit 102.
In the present embodiment, the GHP outdoor unit 2 and the EHP outdoor unit 3 adjust the output according to the cooling load. For example, when the cooling load is a low load, the EHP outdoor unit 3 is driven, the EHP outdoor unit 3 is stopped as the cooling load increases, and the GHP outdoor unit 2 is started. When the cooling load becomes a high load, the EHP outdoor unit 3 is driven in addition to the driving of the GHP outdoor unit 2.
The system control unit 103 controls the GHP outdoor units 2, the EHP outdoor units 3, and the indoor units 4 based on the number of operating indoor units 4, the set temperature, the outside air temperature, and the like, and thereby outputs control signals to the GHP control unit 100, the EHP control unit 101, and the indoor control unit 102 so that the operation based on the GHP outdoor units 2 and the operation based on the EHP outdoor units 3 are the most energy-saving. Thus, the operation control of the GHP outdoor unit 2 by the GHP control unit 100, the operation control of the EHP outdoor unit 3 by the EHP control unit 101, and the operation control of the indoor unit 4 by the indoor control unit 102 can be efficiently performed.
In this case, in the present embodiment, when switching the operation of the GHP outdoor unit 2 and the EHP outdoor unit 3, the controller control unit 111 transmits a switching instruction signal to the GHP control unit 100 and the EHP control unit 101.
For example, when the EHP outdoor unit 3 is stopped and the operation is switched to the GHP outdoor unit 2 during the operation of the EHP outdoor unit 3, the controller control unit 111 transmits a start instruction signal for starting the GHP outdoor unit 2 to the GHP control unit 100. Then, the GHP control unit 100 starts the gas engine 12 of the GHP outdoor unit 2 based on the start instruction signal from the controller control unit 111, and starts the GHP outdoor unit 2.
When the start of the GHP outdoor unit 2 is completed, the GHP control unit transmits a stop instruction signal to the EHP control unit, and the EHP control unit 101 controls the EHP outdoor unit 3 to stop based on the stop instruction signal.
Further, when the GHP outdoor unit 2 is stopped and the operation is switched to the EHP outdoor unit 3 during the operation of the GHP outdoor unit 2, the controller control unit 111 transmits a start instruction signal of the EHP outdoor unit to the GHP control unit, and the GHP control unit transmits a start instruction from the controller control unit to the EHP control unit. Thereby, the EHP control portion 101 starts the EHP compressor 62 of the EHP outdoor unit 3 based on the start instruction signal, thereby starting the EHP outdoor unit 3.
The GHP control unit monitors the activation state of the EHP outdoor unit, and when determining that activation of the EHP outdoor unit is completed, the GHP control unit 100 controls the GHP outdoor unit 2 to be stopped.
This enables continuous operation without temporary stop of the operation.
Next, the operation of the present embodiment will be described with reference to a timing chart shown in fig. 3.
Fig. 3 is a timing chart illustration of the operation and stop of the GHP outdoor unit 2 and the EHP outdoor unit 3.
As shown in fig. 3, in the present embodiment, first, a case will be described in which the EHP outdoor unit 3 is started from a state in which the GHP outdoor unit 2 and the EHP outdoor unit 3 are stopped.
The controller control unit 111 transmits a start instruction signal to the EHP control unit 101, and the EHP control unit 101 starts the EHP compressor 62 based on the start instruction signal. In this state, the operation of the air conditioning system is started.
Then, when the operation is switched from the state in which the EHP outdoor unit 3 is operated to the GHP outdoor unit 2, the controller control unit 111 transmits a start instruction signal for starting the GHP outdoor unit 2 to the GHP control unit 100. Then, the GHP control unit 100 starts the gas engine 12 of the GHP outdoor unit 2 based on the start instruction signal from the controller control unit 111, and starts the GHP outdoor unit 2. When the activation of the GHP outdoor unit 2 is completed, the GHP control unit transmits a stop instruction signal to the EHP control unit, and the EHP control unit 101 stops the EHP outdoor unit 3 based on the stop instruction signal.
Thus, when the operation is switched from the EHP outdoor unit 3 to the GHP outdoor unit 2, the operation of the air conditioning system can be continuously performed without interruption.
When the EHP outdoor unit 3 is started from a state where the EHP outdoor unit 2 is operated and the EHP outdoor unit 3 is stopped, the controller control unit 111 transmits a start instruction signal of the EHP outdoor unit to the GHP control unit, and the GHP control unit transmits a start instruction signal from the controller control unit to the EHP control unit. Thereby, the EHP control portion 101 starts the EHP compressor 62 of the EHP outdoor unit 3 based on the start instruction signal, thereby starting the EHP outdoor unit 3.
Then, the GHP control unit monitors the activation state of the EHP outdoor unit, and if it is determined that activation of the EHP outdoor unit is completed, the GHP control unit 100 stops the GHP outdoor unit 2.
Thus, even when the operation is switched from the GHP outdoor unit 2 to the EHP outdoor unit 3, the operation of the air conditioning system can be continuously performed without interruption.
As described above, the present embodiment includes the controller control unit 111 that transmits a control instruction signal to the GHP control unit 100 and the EHP control unit 101, and the GHP control unit 100 or the EHP control unit 101 activates the GHP outdoor unit 2 or the EHP outdoor unit 3 that is being stopped when receiving a switching instruction signal of the GHP outdoor unit 2 or the EHP outdoor unit 3 from the controller control unit 111, and the GHP control unit 100 or the EHP control unit 101 of the GHP outdoor unit 2 or the EHP outdoor unit 3 controls to stop the GHP outdoor unit 2 or the EHP outdoor unit 3 that is being operated after the activation of the GHP outdoor unit 2 or the EHP outdoor unit 3 is completed.
According to this aspect, after the start-up of the GHP outdoor unit 2 or the EHP outdoor unit 3 is completed, the GHP outdoor unit 2 or the EHP outdoor unit 3 is stopped by the GHP control unit 100 or the EHP control unit 101 of the operating outdoor unit, so that the start-up and stop of the GHP outdoor unit 2 or the EHP outdoor unit 3 can be performed without interruption by the control of the GHP control unit 100 or the EHP control unit 101 for the operation of the air conditioning system, regardless of the switching instruction signal from the controller control unit 111. As a result, the continuous operation of the air conditioning system can be realized, and the deterioration of the air conditioning performance can be prevented.
The above embodiment is an example showing an embodiment to which the present invention is applied, and the present invention is not limited to the above embodiment.
In the above embodiment, the case where the plurality of outdoor units are configured by the GHP outdoor unit 2 and the EHP outdoor unit 3 has been described, but the present invention is not limited to this. For example, the outdoor unit may be constituted by only the plurality of GHP outdoor units 2, or may be constituted by only the plurality of EHP outdoor units 3.
In the above embodiment, the GHP control unit 100 is set as the master control unit and the EHP control unit 101 is set as the slave control unit, but the present invention is not limited to this. For example, the EHP control unit 101 may be set as a master control unit, the GHP control unit 100 may be set as a slave control unit, and the control instruction signal from the controller control unit 111 may be first transmitted to the EHP control unit 101.
Note that, instead of setting the master control unit and the slave control unit, the GHP control unit 100, the EHP control unit 101, and the indoor control unit 102 may be connected in parallel to the controller control unit 111, and the control instruction signals may be transmitted from the controller control unit 111 to the GHP control unit 100, the EHP control unit 101, and the indoor control unit 102, respectively.
Industrial applicability of the invention
As described above, the air-conditioning apparatus according to the present invention can be preferably used to realize an air-conditioning apparatus that can be continuously operated without stopping the operation of each outdoor unit when a plurality of outdoor units are switched to be operated.

Claims (1)

1. An air conditioning device characterized in that:
a plurality of outdoor units connected to the indoor units via inter-unit pipes, respectively, each of the outdoor units being operated to perform indoor air conditioning by the indoor unit,
the plurality of outdoor units are GHP outdoor units comprising GHP compressors driven by an engine and EHP outdoor units comprising EHP compressors driven by a power frequency power supply,
the air conditioning device includes a controller transmitting control instruction signals to the GHP outdoor unit, the EHP outdoor unit, and the indoor unit,
the controller includes a controller control part for collectively controlling the GHP control part, the EHP control part and the indoor control part,
the GHP control unit is set as a master control unit, the EHP control unit and the indoor control unit are set as slave control units, a control instruction signal from the controller control unit is first transmitted to the GHP control unit, and the control instruction signal is sequentially transmitted from the GHP control unit to the EHP control unit and the indoor control unit,
when the start of the GHP outdoor unit is completed, the GHP control unit transmits a stop instruction signal to the EHP control unit, and the EHP control unit controls the EHP outdoor unit to stop based on the stop instruction signal.
CN201910660241.1A 2018-07-30 2019-07-22 Air conditioning apparatus Active CN110779113B (en)

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